Equity Incentive Plans (Details) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Jul. 03, 2011 USD ($)	Jul. 03, 2011
Summary of the activity of stock option awards
Options outstanding, Beginning Balance , Shares	1,401	1,673
Options outstanding, Beginning Balance, Wtd. Avg. Exercise Price	$ 15.01
Options outstanding, Beginning Balance, Wtd. Avg., Remaining Contractual Term	5.84	7.05
Options outstanding, Beginning Balance, Average Intrinsic Value	$ 13,517
Options granted, Shares	554
Options granted, Wtd. Avg. Exercise Price	$ 24.71
Options exercised, Shares	(253)
Options exercised, Wtd. Avg. Exercise Price	$ 8.74
Options forfeited/canceled/expired, Shares	(29)
Options forfeited/canceled/expired, Wtd. Avg. Exercise Price	$ 18.53
Options outstanding, Ending Balance , Shares		1,673
Options outstanding, Ending Balance, Wtd. Avg. Exercise Price	$ 19.11
Options outstanding, Ending Balance, Wtd. Avg., Remaining Contractual Term		7.05
Options outstanding, Ending Balance, Average Intrinsic Value	7,893
Options exercisable at July 3, 2011, Shares		955
Options exercisable at July 3, 2011, Wtd. Avg. Exercise Price	$ 16.31
Options exercisable at July 3, 2011, Wtd. Avg. Remaining Contractual Term	5.54
Options exercisable at July 3, 2011, Aggregate Intrinsic Value	$ 6,917
Summary of the activity of restricted stock
Restricted stock outstanding shares, Beginning Balance	161	486
Restricted stock outstanding Wtd. Avg. Grant Date Fair Value, Beginning Balance	$ 24.60
Granted shares	373
Granted Wtd. Avg. Grant Date Fair Value	$ 24.60
Vested shares	(48)
Vested Wtd. Avg. Grant Date Fair Value	$ 25.75
Forfeited/canceled shares
Forfeited/canceled Wtd. Avg. Grant Date Fair Value
Restricted stock outstanding shares, Ending Balance		486
Restricted stock outstanding Wtd. Avg. Grant Date Fair Value, Ending Balance	$ 23.34